v0.2.55..v0.2.56 changeset ElementIdToVersionMapper.h

diff --git a/hoot-core/src/main/cpp/hoot/core/ops/ElementIdToVersionMapper.h b/hoot-core/src/main/cpp/hoot/core/ops/ElementIdToVersionMapper.h
index 6221449..037e774 100644
--- a/hoot-core/src/main/cpp/hoot/core/ops/ElementIdToVersionMapper.h
+++ b/hoot-core/src/main/cpp/hoot/core/ops/ElementIdToVersionMapper.h
@@ -41,7 +41,8 @@ public:
 
   static std::string className() { return "hoot::ElementIdToVersionMapper"; }
 
-  ElementIdToVersionMapper();
+  ElementIdToVersionMapper() = default;
+  virtual ~ElementIdToVersionMapper() = default;
 
   virtual void apply(const OsmMapPtr& map);